优化: CR-08 i18n batch2全量(ProjectDetail5处+TaskDetail16key+AiChat3处+store error fallback 23处+useAiSend 3处)+@/i18n路径统一+vite别名

src/i18n/zh-CN/projects.ts

@@ -44,5 +44,16 @@ export default {
       cancelled: '❌ 已取消',
       active: '🚀 进行中',
     },
+    // 错误回退(state.error 用户可见)
+    err: {
+      loadFailed: '加载项目失败',
+      createFailed: '创建项目失败',
+      importFailed: '导入项目失败',
+      deleteFailed: '删除项目失败',
+      loadTrashFailed: '加载回收站失败',
+      restoreFailed: '恢复项目失败',
+      purgeFailed: '彻底删除失败',
+      loadWorkflowFailed: '加载工作流记录失败',
+    },
   },
 }